Sökning: "Irrigation"

Visar resultat 1 - 5 av 128 avhandlingar innehållade ordet Irrigation.

  1. 1. Condensation irrigation : a combined system for desalination and irrigation

    Författare :Jenny Lindblom; Luleå tekniska universitet; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Vattenteknik; Water Resources Engineering;

    Sammanfattning : Condensation Irrigation (CI) is a new irrigation method that combines desalination and subsurface irrigation by making use of saline water for supplying clean irrigation. In this system, solar stills are used for evaporating non-potable water, and the formed vapour heats and humidifies the ambient air above the water surface. LÄS MER

  2. 2. Condensation irrigation : simulations of heat and mass transfer

    Författare :Jenny Lindblom; Luleå tekniska universitet; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Vattenteknik; Water Resources Engineering;

    Sammanfattning : There is a growing water demand in the world. Along with the deterioration of existing water supplies, the escalating world population leads to the assumption that two out of three people will lack sufficient freshwater by the year 2025. LÄS MER

  3. 3. Irrigation water management : A performance study of the Rahad scheme in Sudan, 1977-1996

    Författare :Nighisty Ghezae; Uppsala universitet; []
    Nyckelord :SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Economic history; Rahad scheme; irrigation management; water supply activities; agricultural extension activity; performance assessment; main system management; on-farm management; organizational structure; Ekonomisk historia; Economic history; Ekonomisk historia; Ekonomisk historia; Economic History;

    Sammanfattning : The central objectives of this study is to assess the performance of irrigation water management of the Rahad scheme in Sudan between 1977 and 1996. The study assesses how well the scheme has succeeded in achieving irrigation management objectives using the criteria of productivity, equity, cost recovery and environmental stability. LÄS MER

  4. 4. Accumulation from Below : Smallholders and public irrigation investments in Kilombero Valley, Tanzania

    Författare :Victor Mbande; Lowe Börjeson; Johan Berg; Liwenga Liwenga; Klara Fischer; Stockholms universitet; []
    Nyckelord :SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Accumulation; social differentiation; wealth ranking; irrigation; smallholders; agriculture transformation; land use change; rice boom; progressive farmers; development; geografi med kulturgeografisk inriktning; Geography with Emphasis on Human Geography;

    Sammanfattning : Smallholders in Tanzania and elsewhere in Africa are increasingly differentiated. This thesis contributes to the empirical and conceptual understanding of the differentiation processes in irrigation by following the internal dynamics among smallholders linked to public investments in improving smallholder initiated small scale irrigation schemes in Kilombero district, Tanzania. LÄS MER

  5. 5. Modernisation and farmer-led irrigation development in Africa : A study of state-farmer interactions in Tanzania

    Författare :Chris de Bont; Lowe Börjeson; Gert Jan Veldwisch; Mats Widgren; Anna Mdee; Stockholms universitet; []
    Nyckelord :SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; irrigation development; modernity; modernisation; farmer-led irrigation development; expert knowledge; Tanzania; sub-Saharan Africa; Geography with Emphasis on Human Geography; geografi med kulturgeografisk inriktning;

    Sammanfattning : After years of relatively low investment, irrigation development in Africa has been put back on the policy agenda as a way of increasing agricultural productivity. In spite of existing evidence of farmers’ irrigation initiatives across the African continent, current policy prescriptions still revolve around (large-scale) state intervention. LÄS MER